Only very basic testing performed to date.
The wrappers are still a bit incomplete (some structures and functions),
but are much more complete than the old ones.
Fixes artf3796.
Changes from initial changeset:
- Use // for comments.
- Add auto-generate notices to the beginning of each generated file.
- Include error number with error text in exception.
- Add free() function to structures.
- Fix out-of-order / non-array enums.
- Avoid duplicate calls to DisposedStruct.write() as .getAddress() does it.
- Refactor OpaqueStruct.
- Default to no null allowed except when overridden.
- Implement unowned return values.
- Add gen_struct_sizer script.
Change-Id: Ie0d102c45817ea8812d98fe4938d1a2255c61664
